I don't really know anything about it, so I looked it up. My brief research shows that it is designed to be used with some type of "magic box" sort of system, like an ozonator sort of setup, maybe Nature2.
It looks like it may be able to be used on its own too, but basically it's an oxy shock/algaecide product.
Note, I may have this slightly wrong, but this is the gist of it from what I scanned.
I do know for a fact that this forum frowns upon the use of such products, the Nature2 and other "Magic Chlorine Free" systems, simply because they are a waste of money and they just flat don't work!!
It all seems like a bunch of marketing ho-ha and lies by the industry and the manufacturers. I don't buy any of it myself. So I tend to agree, but again, I'm no expert in the stuff.
I wouldn't put anything other than BBB+CYA+MA in my pool.
If it were me, I would post it on Craigslist, marketing it to someone that already uses such things.
It's not like you're passing off something to an unwitting fellow consumer at that point, because they already use it & are familiar with it. So it's their bad if they want to use it, but hey, if it works for them and they have bought into the company's "magical spell", then GREAT!!! More power to 'em.
If not Craigslist, then FleaBay for local pickup only, if it's uneconomical to ship it due to it's weight.
Then take the proceeds and either split it /w your poor buddy who got pool stored, or take him out to a really AWESOME dinner where you can discuss the travesties of the retail pool industry and have a good laugh over it. LOL